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At its core DASM is a java templating library that uses code not written as a template as a template.

There are two key DASM concepts, the Redirect and the Transform:

• A Redirect allows you to specify a how a method should be changed
• A Transform tells DASM to apply a set of redirects to a target

Important

DASM acts on bytecode, in which methods/fields are referenced not just by name but by their exact parameters/type.

As a result if you have a field private Foo foo; and want to redirect it to private Bar bar; both a field redirect from foo -> bar and a type redirect from Foo -> Bar are required. The same applies to method names and method parameters etc.

Otherwise the bytecode will reference bar as if it was a Foo which makes no sense

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Intro

First see this Quick Example

Full Docs

Redirects

• Redirect Sets
• Containers
• Type Redirects
• Method Redirects
• Field Redirects
• Field To Method Redirects
• Constructor To Factory Redirects

Transforms

• Method Transforms
• Class Transforms